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Local data assimilation system in Slovenia

Local data assimilation system in Slovenia. Facts. 4.4 km, 43 levels 439*421 points / 1931.6 * 1852.4 km Aladin cy35t1 ALARO 3MT Timestep: 180s 3h ARPEGE LBC. Observations. All OPLACE observations, except METOP and NOAA-19 local NON-GTS SYNOP data

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Local data assimilation system in Slovenia

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  1. Local data assimilation system in Slovenia

  2. Facts 4.4 km, 43 levels 439*421 points / 1931.6 * 1852.4 km Aladin cy35t1 ALARO 3MT Timestep: 180s 3h ARPEGE LBC

  3. Observations All OPLACE observations, except METOP and NOAA-19 local NON-GTS SYNOP data No assimilation of SYNOP T2m and RH2m in 3DVAR

  4. SMS assimilation suite

  5. ODB / bator • Merge of locally prepared obsoul and OPLACE for conv • Created by subbases: conv amdr geow wpro sats sevb • Fix in BATOR to avoid crash in case of no observations selected by lamflag • Blacklisting not modified (from Hungary)

  6. Screening & minimization Constant bias correction: VARBC tested, but not yet sufficiently validated NITER=70, NSIMU=80 B matrix computed for July 2007 (~ 450 forecast differences), (downscaled) ensemble method REDNMC=1.3 (not tuned yet)

  7. Verification T 850 FF 700 2m RH and T assimilation? Z 700

  8. Problems “Packing bug” Negative Ts at some grid point Disappears if fields not packed (NVGRIB=0) Reproducible on some clusters, on others not Final solution: not pack surface fields (~10 % increase in file size)

  9. Developments I LSAF Albedo

  10. Developments II Snow assimilation (CANARI + LSAF)

  11. Near future tasks Production suite + visualization and verification in operations Validate VARBC Improve observational usage Estimate/tune observational and background errors Add CANARI snow analysis Test and validate 3 hour RUC

  12. Longer term Assimilate aircraft data, collected by a radar in Ljubljana airport (not really AMDAR) Test IASI and probably use it (will have 1py in 2011 - 2012)

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